HYDROGEN FREE

EJ-313

EJ-313 is based on highly purified hexafluorobenzene. Because it is almost free from hydrogen, it is relatively insensitive to fast neutrons, making EJ-313 useful for gamma ray detection in a fast neutron flux.1 According to Jupiter and Parez2 the ratio of the relative gamma ray response to neutron responses for EJ-313 compared to a xylene-based liquid scintillator is 14.5 for 2.6 MeV neutrons and 8.5 for 1 MeV neutrons. Ewen and Gonsior3 found that the gamma ray and neutron efficiencies of this hydrogen-free scintillator to be 25% and 0.4% respectively, relative to those of a NaI(Tl) detector.